energy

Question 1

work

Answer 1

Work

The transfer of energy when a force moves an object, in joules.

Question 2

lever

Answer 2

Lever

A type of machine which is a rigid bar that pivots about a point

Question 3

input force

Answer 3

Input force

The force you apply to a machine

Question 4

out put force

Answer 4

Output force

The force that is applied to the object moved by the machine

Question 5

displacement

Answer 5

Displacement

The distance an object moves from its original position

Question 6

deformation

Answer 6

Deformation
When an elastic object is
stretched or squashed, which requires work

Question 7

what is work done measured in

Answer 7

Work done and energy transferred are measured in joules (J).

Question 8

is work a form of energy

Answer 8

Work is not a form of energy - it is one of the ways in which energy can be transferred.

Question 9

how does momentum change happen

Answer 9

A change in momentum happens when a force is applied to an object that is moving or is able to move.

Question 10

what happens to total momentum in and explosion or collision

Answer 10

4. The total momentum in an explosion or collision stays the same.

Question 11

how do objects turn

Answer 11

1. Forces can make objects turn if there is

a pivot.

Question 12

what is the pivot

Answer 12

2. The pivot is the fixed point somtehing will rotate around

Question 13

what is the turning force around the pivot called

Answer 13

3. Turning forces around a pivot are

called moments.

Question 14

how do you work out a moment

Answer 14

4. If the turning forces are balanced, we say  
the moments are equal and opposite 
Working out moments 
To work out a moment, we need to know  
two things: 
• The distance from the pivot that the force  
is applied. 
• The size of the force applied 
This is the equation for working out a  
moment: moment = force × distance

Question 15

energy

Answer 15

Energy

Associated with changes in temperature or with work

Question 16

joule

Answer 16

Joule

The unit of energy, symbol J.

Question 17

law of conservation of energy

Answer 17

Law of
conservation of energy
Energy cannot be created or destroyed, only transferred.

Question 18

chemical energy

Answer 18

Chemical energy

Energy stored in the bonds of substances.

Question 19

thermal store

Answer 19

Thermal store

Energy in objects as a result of the motion of their particles

Question 20

kinetic store

Answer 20

Kinetic store

Energy of moving objects.

Question 21

gravitational potential energy

Answer 21

Gravitational
potential energy
Energy of due to the position of an object in a gravitational field.

Question 22

elastic potential energy

Answer 22

Elastic potential energy

Energy stored when objects change shape.

Question 23

temprature

Answer 23

Temperature

A measure of how hot or cold something is, measured in degrees, Celsius.

Question 24

conduction

Answer 24

Conduction

Way in which energy is transferred in solids.

Question 25

convection

Answer 25

Convection

Transfer of energy by the movement of gases or liquids.

Question 26

radiation

Answer 26

Radiation

Transfer of energy as a wave.

Question 27

fossil fuel

Answer 27

Fossil fuel

Coal, oil or gas. Finite resource.

Question 28

work

Answer 28

Work

A way of transferring energy that does not involve heating.